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Thermal stability and specific heats of {[bpy][BF4] + [bpy][Tf2N]} and {[bpy][BF4] + [4bmpy][Tf2N]} mixed ionic liquid solvents

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Abstract

In the last years, mixing ionic liquids (ILs) is a common trend looking for IL-based solvents with high extractive properties in the liquid–liquid extraction of aromatics from alkanes. The aim of mixing ILs is to find intermediate extractive properties between ILs which showed good selectivity and those with high aromatic capacity of extraction. In addition to this, there are several thermophysical properties that are of interest to evaluate an IL-based solvent. Therefore, many studies have been carried out focusing on the knowledge of density, viscosity, or surface tension behavior of IL mixture, proposing several mixing rules that could correctly predict these magnitudes from pure IL data in most of the mixtures studied. However, only a few measurements of thermal stabilities and specific heats for IL binary mixtures have been recently realized. The present study was aimed to evaluate the thermal stability of {[bpy][BF4] + [bpy][Tf2N]} and {[bpy][BF4] + [4bmpy][Tf2N]} IL mixtures by thermogravimetric analysis. Also specific heats of the IL mixtures were determined using differential scanning calorimetry.

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Acknowledgements

The authors are grateful to the Ministerio de Economía y Competitividad of Spain and the Comunidad de Madrid for financial support of Projects CTQ2011-23533 and S2009/PPQ-1545, respectively. Pablo Navarro thanks Ministerio de Economía y Competitividad of Spain for awarding him an FPI grant (Reference BES-2012-052312). Marcos Larriba also thanks Ministerio de Educación, Cultura y Deporte of Spain for awarding him an FPU grant (Reference AP2010-0318).

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Authors and Affiliations

  1. Department of Chemical Engineering, Complutense University of Madrid, 28040, Madrid, Spain

    Pablo Navarro, Marcos Larriba, Julián García & Francisco Rodríguez

  2. Department of Chemical Engineering, Faculty of Sciences, Aix-Marseille University, 13013, Marseille, France

    Jean-Baptiste Beigbeder

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  1. Pablo Navarro
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  2. Marcos Larriba
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  3. Jean-Baptiste Beigbeder
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  4. Julián García
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Correspondence to Julián García.

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Navarro, P., Larriba, M., Beigbeder, JB. et al. Thermal stability and specific heats of {[bpy][BF4] + [bpy][Tf2N]} and {[bpy][BF4] + [4bmpy][Tf2N]} mixed ionic liquid solvents. J Therm Anal Calorim 119, 1235–1243 (2015). https://doi.org/10.1007/s10973-014-4220-6

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